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Design of a More Efficient Rotating-EM Energy Floor with Lead-Screw and Clutch Mechanism

Author

Listed:
  • Thitima Jintanawan

    (Department of Mechanical Engineering, Chulalongkorn University, Bangkok 10330, Thailand)

  • Gridsada Phanomchoeng

    (Department of Mechanical Engineering, Chulalongkorn University, Bangkok 10330, Thailand
    Micro/Nano Electromechanical Integrated Device Research Unit, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand)

  • Surapong Suwankawin

    (Department of Electrical Engineering, Chulalongkorn University, Bangkok 10330, Thailand)

  • Weeraphat Thamwiphat

    (Department of Mechanical Engineering, Chulalongkorn University, Bangkok 10330, Thailand)

  • Varinthorn Khunkiat

    (Department of Mechanical Engineering, Chulalongkorn University, Bangkok 10330, Thailand)

  • Wasu Watanasiri

    (Department of Mechanical Engineering, Chulalongkorn University, Bangkok 10330, Thailand)

Abstract

There is an interest in harvesting energy from people’s footsteps in crowded areas to power smart electronic devices with low consumption. The average power consumption of these devices is approximately 10 μW. The energy from our footsteps is green and free, because walking is a routine activity in everyday life. The energy floor is one of the most efficient pieces of equipment in vibration-based energy harvesting. The paper aims to improve the previous design of the energy floor—called Genpath—which uses a rotational electromagnetic (EM) technique to generate electricity from human footsteps. The design consists of two main parts of (1) the EM generator, including the lead-screw mechanism for translation-to-rotation conversion, and (2) the Power Management and Storage (PMS) circuit. The improvement was focused on the part of the EM generator. A thorough investigation of the design components reveals that the EM generator shaft in the previous Genpath design cannot continuously rotate when the floor-tile reaches the bottom end, resulting in no energy gain. Therefore, a one-way clutch is implemented to the system to disengage the generator shaft from the lead-screw motion when the floor-tile reaches the allowable displacement. During the disengagement, the EM generator shaft still proceeds with a free rotation and could generate more power. In our analysis, the dynamic model of the electro-mechanical systems with the one-way clutch was successfully developed and used to predict the energy performances of the VEH floors and fine-tune the design parameters. The analytical result is shown that the spring stiffness mainly affects the force transmitted to the EM generator, and then the induced voltage and power of the generator, thus, the value of the stiffness is one of the critical design parameters to optimize. Finally, the new prototype consisting of 12-V-DC generator, mechanisms of lead-screw and clutch, as well as coil springs with the optimal stiffness of 1700 N/m was built and tested. The average energy produced by the new prototype is 3637 mJ (or average power of 3219 mW), per footstep which is 2935 mJ greater than that of the previous design. Moreover, to raise the social awareness about energy usage, the sets of Genpath have been used to organize an exhibition, “Genpath Empower our Journey”. The people who stroll forward on the paths can realize how much energy they gain from their footsteps.

Suggested Citation

  • Thitima Jintanawan & Gridsada Phanomchoeng & Surapong Suwankawin & Weeraphat Thamwiphat & Varinthorn Khunkiat & Wasu Watanasiri, 2022. "Design of a More Efficient Rotating-EM Energy Floor with Lead-Screw and Clutch Mechanism," Energies, MDPI, vol. 15(18), pages 1-18, September.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:18:p:6539-:d:909370
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    References listed on IDEAS

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    1. Liu, Mingyi & Lin, Rui & Zhou, Shengxi & Yu, Yilun & Ishida, Aki & McGrath, Margarita & Kennedy, Brook & Hajj, Muhammad & Zuo, Lei, 2018. "Design, simulation and experiment of a novel high efficiency energy harvesting paver," Applied Energy, Elsevier, vol. 212(C), pages 966-975.
    2. Thitima Jintanawan & Gridsada Phanomchoeng & Surapong Suwankawin & Phatsakorn Kreepoke & Pimsalisa Chetchatree & Chanut U-viengchai, 2020. "Design of Kinetic-Energy Harvesting Floors," Energies, MDPI, vol. 13(20), pages 1-19, October.
    3. Young-Man Choi & Moon Gu Lee & Yongho Jeon, 2017. "Wearable Biomechanical Energy Harvesting Technologies," Energies, MDPI, vol. 10(10), pages 1-17, September.
    4. Hassan Elahi & Khushboo Munir & Marco Eugeni & Sofiane Atek & Paolo Gaudenzi, 2020. "Energy Harvesting towards Self-Powered IoT Devices," Energies, MDPI, vol. 13(21), pages 1-31, October.
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